Dichloroethanes, 1,1-difluoroethane

Current option 136, 214 density matrix 263 l,2-dichloro-l,2-difluoroethane 24 dichloroethane 239, 242 dielectric constant 239 diffuse functions 99 difluoroethylene 45 dihedral angles 290 valid range 288 n,n-dimethylformamide 105 dipole moment 20... 

The optimized operating conditions for each analytical method including the detector system of choice are reported in Table II. The reported columns and operating conditions yield satisfactory peak shapes and resolution of all the potential interferents evaluated for HCCP and HCBD. Two potential interferents—tetrachloro-l,2-difluoroethane and 1,2-dichloroethane— could not be separated from 1,2-DCP with conventional packed columns. Tetrachloro-l,2-difluoroethane, a compound with physical properties similar to 1,2-DCP, is not likely to be found with... 

Bromo-l-chloro-l,l-difluoroethane (3) is prepared from l,2-dibromo-l,l-dichloroethane (1) in good yield when the fluorination reaction with antimony(III) fluoride/antimony(V) chloride is conducted in two steps. 

The reaction of 1-chloro-l-fluoroethane over copper(II) chloride or alumina at 180°C yields 1,1-difluoroethane and 1,1-dichloroethane.32 The conversion is 70% and the yields of both compounds are 40 and 38 %, respectively. This indicates that only minimal hydrogen chloride formation may occur during this disproportionation. 

Fig. 8. Plausible torsional potential curve for 1,2-dichloroethane (left) and 1,2-difluoroethane...

Ethylidene chloride see 1,1-Dichloroethane Ethylidene fluoride see 1,1-Difluoroethane Ethyl iodide see lodoethane... 

Predicted SQM IR spectra for 1,2-difluoroethane (a) IR spectrum for trons-1,2-dichloroethane, (b) IR spectrum for gaucfie-1,2-dichloroethane, (c) IR spectrum for 1,2-dichloroethane at room temperature... 

The orbitals are bent in about the same direction with the gauche form, giving it the lower energy in this case. The effect of diffuse functions on the electron density distribution is in agreement with this proposal. It should be related to the electronegativity, and so it is not surprising that the gauche preference is smaller for 1,2-dichloroethane than for 1,2-difluoroethane. 

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